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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: PrefixKVTransaction.html 878 2015-04-17 01:32:03Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv.util;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.jsimpledb.kv.KVTransaction;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>/**<a name="line.12"></a>
<span class="sourceLineNo">013</span> * {@link KVTransaction} view of all keys having a common {@code byte[]} prefix in a containing {@link KVTransaction}.<a name="line.13"></a>
<span class="sourceLineNo">014</span> *<a name="line.14"></a>
<span class="sourceLineNo">015</span> * &lt;p&gt;<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Instances are normally created indirectly from {@link PrefixKVDatabase} instances via {@link PrefixKVDatabase#createTransaction}.<a name="line.16"></a>
<span class="sourceLineNo">017</span> * Instances may also be created directly from an existing {@link KVTransaction}; in that case,<a name="line.17"></a>
<span class="sourceLineNo">018</span> * {@link #setTimeout setTimeout()}, {@link #commit}, and {@link #rollback} forward to the containing transaction,<a name="line.18"></a>
<span class="sourceLineNo">019</span> * while {@link #getKVDatabase} throws {@link UnsupportedOperationException}.<a name="line.19"></a>
<span class="sourceLineNo">020</span> * &lt;/p&gt;<a name="line.20"></a>
<span class="sourceLineNo">021</span> */<a name="line.21"></a>
<span class="sourceLineNo">022</span>public class PrefixKVTransaction extends PrefixKVStore implements KVTransaction {<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>    private final KVTransaction tx;<a name="line.24"></a>
<span class="sourceLineNo">025</span>    private final PrefixKVDatabase db;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>// Constructors<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>    /**<a name="line.29"></a>
<span class="sourceLineNo">030</span>     * Constructor that wraps an existing {@link KVTransaction}. There will be no associated {@link PrefixKVDatabase}.<a name="line.30"></a>
<span class="sourceLineNo">031</span>     *<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * @param tx the containing {@link KVTransaction}<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * @param keyPrefix prefix for all keys<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * @throws IllegalArgumentException if {@code tx} or {@code keyPrefix} is null<a name="line.34"></a>
<span class="sourceLineNo">035</span>     */<a name="line.35"></a>
<span class="sourceLineNo">036</span>    public PrefixKVTransaction(KVTransaction tx, byte[] keyPrefix) {<a name="line.36"></a>
<span class="sourceLineNo">037</span>        this(tx, keyPrefix, null);<a name="line.37"></a>
<span class="sourceLineNo">038</span>    }<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>    /**<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * Constructor for when there is an associated {@link PrefixKVDatabase}.<a name="line.41"></a>
<span class="sourceLineNo">042</span>     *<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * @param db the containing {@link PrefixKVDatabase}<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * @throws NullPointerException if {@code db} is null<a name="line.44"></a>
<span class="sourceLineNo">045</span>     */<a name="line.45"></a>
<span class="sourceLineNo">046</span>    PrefixKVTransaction(PrefixKVDatabase db) {<a name="line.46"></a>
<span class="sourceLineNo">047</span>        this(db.getContainingKVDatabase().createTransaction(), db.getKeyPrefix(), db);<a name="line.47"></a>
<span class="sourceLineNo">048</span>    }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>    private PrefixKVTransaction(KVTransaction tx, byte[] keyPrefix, PrefixKVDatabase db) {<a name="line.50"></a>
<span class="sourceLineNo">051</span>        super(keyPrefix);<a name="line.51"></a>
<span class="sourceLineNo">052</span>        if (tx == null)<a name="line.52"></a>
<span class="sourceLineNo">053</span>            throw new IllegalArgumentException("null tx");<a name="line.53"></a>
<span class="sourceLineNo">054</span>        this.tx = tx;<a name="line.54"></a>
<span class="sourceLineNo">055</span>        this.db = db;<a name="line.55"></a>
<span class="sourceLineNo">056</span>    }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>// PrefixKVStore<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>    @Override<a name="line.60"></a>
<span class="sourceLineNo">061</span>    protected KVTransaction delegate() {<a name="line.61"></a>
<span class="sourceLineNo">062</span>        return this.tx;<a name="line.62"></a>
<span class="sourceLineNo">063</span>    }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>// KVTransaction<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>    /**<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * Get the {@link PrefixKVDatabase} associated with this instance.<a name="line.68"></a>
<span class="sourceLineNo">069</span>     *<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * @throws UnsupportedOperationException if this instance was created directly from a containing {@link KVTransaction}<a name="line.70"></a>
<span class="sourceLineNo">071</span>     */<a name="line.71"></a>
<span class="sourceLineNo">072</span>    @Override<a name="line.72"></a>
<span class="sourceLineNo">073</span>    public PrefixKVDatabase getKVDatabase() {<a name="line.73"></a>
<span class="sourceLineNo">074</span>        if (this.db == null)<a name="line.74"></a>
<span class="sourceLineNo">075</span>            throw new UnsupportedOperationException("instance was not created from a PrefixKVDatabase");<a name="line.75"></a>
<span class="sourceLineNo">076</span>        return this.db;<a name="line.76"></a>
<span class="sourceLineNo">077</span>    }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>    @Override<a name="line.79"></a>
<span class="sourceLineNo">080</span>    public void setTimeout(long timeout) {<a name="line.80"></a>
<span class="sourceLineNo">081</span>        this.delegate().setTimeout(timeout);<a name="line.81"></a>
<span class="sourceLineNo">082</span>    }<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>    @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span>    public void commit() {<a name="line.85"></a>
<span class="sourceLineNo">086</span>        this.delegate().commit();<a name="line.86"></a>
<span class="sourceLineNo">087</span>    }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>    @Override<a name="line.89"></a>
<span class="sourceLineNo">090</span>    public void rollback() {<a name="line.90"></a>
<span class="sourceLineNo">091</span>        this.delegate().rollback();<a name="line.91"></a>
<span class="sourceLineNo">092</span>    }<a name="line.92"></a>
<span class="sourceLineNo">093</span>}<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>




























































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